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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3c800ccccf4c3d890ca44b623f902f323e277ba738b51824e0961011b230e02' 
  AND token = 'rb7Wq16LMSybxS+YRt9ZUoyeN/QaAjc6lPjmlNv+8PU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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