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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00a92da939e05f253bfd399ddc6c06e80645b90dbbf951deec6750d72c102054' 
  AND token = '4jt7LGG3eGYuFrtQMk/1osSsQlCX7ZGu43OPxgfLceY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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