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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9687fc246e8a9f75a5bdf21775894042f4aa9ebc4b2dc57af5d2f8e8e5d1138' 
  AND token = 'qa24Gc/OgpgVuLpqGUt9wLfiUqaPUj8ZnnpISgf+Ba8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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