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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26f4412b63053ff35bdb2ae654ff30529f17e9ad38b09f0793da0dd2d8ca1777' 
  AND token = 'X6P2VDG5i9NhqDVQBEukJoBJWfC0lGdT4yUIBJ5FYcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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