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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8e36d27f46f2a34ac6edf5ed9a63aeb1c5f5eee8e01028316a4ae5c323ea596' 
  AND token = '8ogZF7+Md7B0qzZIxxGi/0yZTZrxzCKA8ErbizaKxkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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