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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f238812176245263dec016114b5be31c85738331f7ab9575da9c164ce536b54' 
  AND token = 'OxzaE9m+ZRLmAgjX7Tf2mc8yICWNtHvExMgskQ+pTpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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