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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c41c0dd3627e5bb6a1d7e6991b8dab4093b4a40972f97971733abf679923d9ca' 
  AND token = 'DqC2Blz/7B6qGmHtlMoHDR0soviXlFKotDYDRD5tzs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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