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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '482f9a0ebe647ea63f83a9b79504c5fc856e803d6ae881d88d34331d257ca1fb' 
  AND token = 'e87iu6nc4BhSNqPXaXP4/UILW82MTSMy6zuvJLVCUk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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