SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '091b4ecf90a7a84c438b69b39eb2f34ce4da78967b10573d7b3cdfca4008e179' 
  AND token = 'fSqMoEwhEYJ/9UG6jpjkseVxnQP+IPF4vQO25SBF/cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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