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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038a24cdc68ad860a331a83a39b23d874b2911b65b4699c274d24925b175b611' 
  AND token = 'cN0m/mJsrA6OKCkVu8ONo8S78AS57bmY3eA4HDh5ngY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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