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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '387cc268ef22ff4350320b260ce724fd6c1c9bdcc8e356c07c471fa36be7416f' 
  AND token = 'F4cKVoyZvfcj0hGehLjMQGdw8HjU0SmdEPN4imT09/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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