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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df56d72721a4f4dd45f3c17ec36a38ea9babaf8b76f45f2d978f111139f4ad3b' 
  AND token = 'PecOIgLY7NCPXaI27hV68IFUcDmIXGX+om+zr/4DEaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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