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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96031d0eb8e60da91e860130b8abd3ce170c951d229881a77473e4338bff5ecd' 
  AND token = '7l+AZeXPfiDcRLst37mfXjKxgvDCUWd0XFYy327ucb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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