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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0680e39e05f52d097f84e8b7550ac6dc11cd7e4ffd0a85b8092ffc489a41fc' 
  AND token = '0BuW/rF5GUjEO9aq+5qHCETrGFfPWkXoh8rKjKjy+vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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