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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e1bc09967e266f35195abc14d931b95c57c8f160b17e5783f7375d6e7e48760' 
  AND token = 'Nj8LZb+cAyeo52TUtSinkvtYzpEWUgmRZ3I5R1qbCfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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