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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db96d338b60c08bd2d921992af2d1966a9cc479bfd992c8d228e15ad338f07ad' 
  AND token = 'uRN6yd62rPJGtrfzeRWAZsPDBN6OMNVK4KSKv+63OQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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