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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80cf56600edee27a6aacfdbf2b0888f7b2d37108e5c4dbe017f8f899a08c4fff' 
  AND token = 'lvmXkPstDfobL958RK1krK0e8pfkHWnUUhxDJT7UeWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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