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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aac41805bd715cb60478ca0aadb5dcc6dc8533765ed0b4d1cc0d476345b9cb3' 
  AND token = 'G8zzpizWjKAM7GrNfWk9XgEy6TYjAzb6L64Lw7Mugs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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