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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f65d4ff7e5c2fff9bdaa3d306d667c8168389c5c229f38d39c18b42ca6ba6ed5' 
  AND token = 'bAuj+MX6H8Na0m4dCtYgcEeG01Gy5Mh4Q9SeaTHgh80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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