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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d04fa3ae5d6c8336ef6c75051714db5405601accc546e3637bd61b5e3b08be3' 
  AND token = 'KNnTFa07A9mKQBD8cPpg7JLkfOmyqDCLjHli3MVtjRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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