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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0a61dc60859cba83b3cc7e498d76c6a2a8fd55ecebb7eda2bca5bf80f80fd47' 
  AND token = 'bJH12bHCt3ar+PsjshonZBE0HRevVBIseWy8uOGfH78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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