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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27988bf7a815107ea9ee1d132bb42948efd926a47639b1d952718452f4092e52' 
  AND token = 'MmJ6HKVb1ivrSbFJQX+Tb1pc0Lh0rVC688psJl++Jow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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