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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c15ddc5eab6eb0a9f716403fedc6e34d1e2cd22dbd4b0796c3d407dfc73d0da' 
  AND token = 'ZHEL6Fv575LYttfXrF7dWflNZyWdwomJQoWSKtRFYic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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