SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b74457d1129a3a849af01d470dc998f5ea6db6582f095a2f8a28ce28fae8a387' 
  AND token = 'WQnjwrXRQ6Qscva9zLUQJX3l7g5ZAqUoMp0bVGWAVuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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