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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5869039603b700a3005d619ed17ec36843ac7f65bf57b5671a961fb1bd8f56b' 
  AND token = 'LIo+N+R1ZMdn8ktkfTE9TzIp/8iVjHQNxPEXLiAynV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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