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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3e38d1053817fbe6dcf4ccf5b5312486ff84c85c005737b032f201dc54a82b8' 
  AND token = 'TKfqPcQSDEGPvOC6JVKRfZ9yzes/2KgeNfag1z6BcGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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