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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd15150d0011828e4ba035a34d88b76227be1dc946e8ed4958883bd5f0890e534' 
  AND token = '/o0IV9aYsS9dCsXYVqfVegYJIr+NWZIM9KcFXjycAX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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