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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b8bafb5d0116277839c6a66cca74b781d5af07a1b65d7970466dddf52bd9e1e' 
  AND token = '637wR7wucgojVYMrXIU4VwqqtUv3o8TpwbAjrfJSVJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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