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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be41b4447e803b68b467a5e93fb1ca2a0d80fd079ae80fa2207f3f2ec60e6aad' 
  AND token = 'K1jMXlhH0/YOyNL7MZUegZsHQEN/j9UGxBhNy3dXnZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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