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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8348a71353859364b8bd8b8d4353b5198b63c7d0aaa584fb4e65f9b4a67d59e4' 
  AND token = 'h8kxKrae1Uuy9i0KjrbbTFe3rBbpQg+j4qhuRR0sm20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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