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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '957f52c8e05d87f742a1fdc0d7d4d075753c809a4ea20945ef624b2f980ff3a5' 
  AND token = 'xOnwyX4HCc4C116ZfAeUG9rU8Stlc8oYWRkdWgeowJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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