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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec820ce0df31d14bfda26077923ba06de33dc219d542852fbe78311b99cf222b' 
  AND token = 'KkzYSl9U1loRIZz5FmICETi/Z7B0YpvBBS/U+5XAWMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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