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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd012267294a9c2d1bd87faa5276f878d1094f7df72ff27de86e95014fb7871bc' 
  AND token = '6GKOzT//EZRugG1OmbuPmN7RnqJa2fnxkfp9AvBxIBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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