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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8d56a46f770b57f2ea397c6f20a02c5906186ff6aa89c30ccca6ec14ec69e18' 
  AND token = '5dMhvHpQJtoh2lt5+jKrhcCwiwiszvd34XibzHTVMbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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