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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b27bec7725a92f598a00c9b5b107e7ed1f838b4acd4153af85ddf87dbe49a75e' 
  AND token = 'xBmy4xP7hfKqDyi2E194/ZTAGCvh3WEFbc7v3YPoMbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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