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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'add59ea7f1e5fec76b616c5d3468b5807306c74c4aec564671e8a8af632515c8' 
  AND token = 't8e9VlHG9/rY2sy2mTgLGrSyY3eEF4Bf+9iPxS8Jg5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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