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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c5df3e4e0df946cc2b7a61786d37430ab5ad7f19cb0e43dd707555d9c621a7a' 
  AND token = 'ncLyb7lyWmZCHz30XUlL6/Z28lZl7lJnvpAk0tYXcLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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