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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a1df3029577fff042a60c4c081144e078a34a122667dd06e91cedae26ac39bb' 
  AND token = 'HsxKFltot6VEJmJwh17O9cT9SWZpbhmFPKhFqAl8Jg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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