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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15b1d453282f541bf7bc9e037fe47bb440b85cad840558471bbf0d38e4eed574' 
  AND token = 'gutLP+E4unhjtAzc/3u3Mnrxg8tIx4uIWmZ79u4NUzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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