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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc35844219478c104c9c9522ec11bb266f2a0787676ff1c4374027e40c1c41cc' 
  AND token = 'eFT3CEVkLLuCGAaT6pVrecnOI6jKaN0xKb7j6M/2BFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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