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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e5cf31ddb6098790eb606456a2b202438555fe9014bcf8f7dc93c6aa997d46b' 
  AND token = 'qYvLcDyqaohhnfoIXd2cmzCb1Lrsuetx3XiCnTUQpmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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