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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9715136fa427b33ca861b318a8f83de179f339a35c2676cd49a6c01e5d861b34' 
  AND token = 'nqP4fQM4XSuBcKHUd0hkyMDae+62N1DMt8As0Vk0Gk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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