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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbd3b180348a2b913a13b181e13ef92e52e2c2a4f5955e48d3edb17e178afb9a' 
  AND token = 'Kr7IRr0z76uW8LuZtXm1ACyHjVr+NX1Mx85wmLR4S6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}