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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37afafdaa6e89689eef7c403468e59bb04debe7e60b540f86932665cd34bd010' 
  AND token = '57A5pWvZgJw3CF+Skc8fywrxrd25m0LDZYQpi7O5tUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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