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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bfb112e13bc46b007d4e5483b8841cd8951173b69d9320c5fe4e4a3a48810d3' 
  AND token = 'G6K6wJo8OqWGo9P33WNBzzS1Ztagm2GQWxcOFpKT7Ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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