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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc69a4a2331fa8b9235da36108988217bcdf0bfbe7b455a98a68d9e77fe6258f' 
  AND token = 'PXhLn5kyGDbNyN1MuUycRQtt2ftmOdWnWYWGC8VXNZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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