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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f294a52f332733e5ff9dc6da1122548f4f0dd23ed478fdaff00c19c7f4af5fb' 
  AND token = '9XdUX5d7JwmGYrRaCpWAb7qYd2do/KU7lyAopT7cy9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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