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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5912120618ba38b120b1f4bfc0cd3b07ccc60b14586713be89ee4faacd4cabb0' 
  AND token = 'YrVOJQfdFU83cYqed+5Bs9/ihWQ8LiWQ3L7qq8a2Sdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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