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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '925019e067f622108eb53b8db8b62bcf46eedafb6cb814d69283c449893db7d9' 
  AND token = 'lSvwQwsh3NcmD6Kli5NnheyxZjenSvauu2qUvT38O4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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