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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '421325bd6a33f70e1f24c4571b5d6278391b7a502e61f9ce9553bc4b9c373bea' 
  AND token = 'B0yDrFOosWfh9Ln6kBq0blBFoGLKmO2NRxYi9iH1Trk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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