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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a6547a0178d9e795817cb74571655999ec54906373405cee5e5ef957627f023' 
  AND token = 'eEo/T+q2DnH4qHryqlpTBqGlBpSnWUzrEVBSh7TuACw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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