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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90dd03dc7fb5fa3b4c59e7dd21b4a31ae2ec057321cfb1a146c71f4360fd27a2' 
  AND token = 'Ih/WL+o6VjiPXRzj4D6FS69f0bol0Wz5BrWqdPqLzkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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