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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dbb1978cfa2f71e66f9c21d767e89da16948b5f44e6f37ab97df32e5959981e' 
  AND token = 'ZsrU8QHiTU7nZWfUA73r9nYZ5bNTfT1Ygu9NBMsTUs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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