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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf3d8133f71b1a6eaf39a2fa73548f4c809d6b337fcb2651b8f20ffe7b031bc2' 
  AND token = '+gNmt0GZw2GyYhH3ZpLQ3zn5a8/smIE8d39qbmLct0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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