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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cec367e94c1fbd2a76dcdf5b79153a4ad86ab03387c7713574cdb1e383bd0d5' 
  AND token = 'C3sX+TZhucz07tU765QkxsUCXZA4Q5hicWDDHIYVoCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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