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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6a1cb41d947d4ea3838a0c93d70f052316fff3e1670e8f0569ccce1b3daba15' 
  AND token = 'mQHqtyxtKZPP9nJI61nb3yG/Lg+f0O9AmAYwR23LEko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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