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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b38ab230fc83be29624993d31e14c6e7b399f99c58bf84add3d08db0386345a' 
  AND token = 'fpJ9MSUOhmleQ1Nt+H6Kwy73Qih3BS6Qond7Urw2kSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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