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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c32d41addc0c89953281419d92000540daa17a76111e68f1317a48a48bad99a9' 
  AND token = '5mLXg9Yg0MdYEofFIC45pmUUzK/m9bnEnGcpqBaR3fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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