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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edc8841528bf2ab70868d3333a7764ffc8995bae474b310338cc2e33134eee46' 
  AND token = 'oLba/YoTawgzOA4NHzu4bOO2rtXk9GMlGSb2Ie2dZcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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