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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef49cd62a682f6982febba8bdef94307b9a2a7bb2032387e4a43a8d494cf0d83' 
  AND token = 'ScdlMYFd+6YIbHM8/oI+BEhjsm7zuBCDHn3xt5UBa+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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