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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ebb5b46dc1a93c4102f015d1865a23beb3d5806f4e1670bf24aae1bf7860b6e' 
  AND token = 'plkaJ8IQbDP6rkv1QqKibB3Kq+rPMxBu40yUJx4w4no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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