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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3729db641e0cb26e162fc980717b31fcbbc4a7ea723349ad207b90a0f60f43a3' 
  AND token = 'gZ0ZWd79VD07zPoBQT9YDaq84+2FY+dnpB/NvfzgWNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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