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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '369a8c8036bf6406308183021b05eecab0ebfa09fedc5f9ca9fb4221d53da24e' 
  AND token = 'YsLtKhA2VuP5muhKC/JvovKcAsi2l6Stub/QVMVpalw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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